If leotards and bike shorts can go to Z Space, Pacemakers being inside your body definitely can. I feel like stuff like small earings, tattoos, nail acrylics, and hair cuts could be saved too given the logic of the skin tight clothing. The series is a little inconsistent with the details but imo based on what we do see in the series, when it comes to morphing things that aren't part of genetic code, you have to actively imagine it forming with the rest of your body? Like, Rachel in 2 mentions imagining a certain haircut while she morphs, and not liking it because it's uneven at the bottom.